The water tank would make an ideal battery box wagon to follow a loco. The tank is easily removable and its internal dimensions are 150 mm long, 90 mm wide, 48 mm high. Overall the wagon is 232 mm over couplings and 103 mm wide. The tank is made of MDF to better represent iron plate, with lots of rivet detail, a central filler cap and inspection ports for the sides or ends. Model comes with everything but paint and glue.